docs: def nvc2pl(normal, constant):
      """
      Make a plane from a normal vector and a constant.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/nvc2pl_c.html
  
      :param normal: A normal vector defining a plane.
      :type normal: 3-Element Array of floats
      :param constant: A constant defining a plane.
      :type constant: float
      :return: plane
      :rtype: spiceypy.utils.support_types.Plane
      """
      plane = stypes.Plane()
      normal = stypes.toDoubleVector(normal)
      constant = ctypes.c_double(constant)
      libspice.nvc2pl_c(normal, constant, ctypes.byref(plane))
      return plane